<!DOCTYPE html>

<html lang='en'>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/react.development16.4.0.js"></script>
    <script src="./lib/react-dom.development16.4.0.js"></script>
    <script src="./lib/babel.min.js"></script>
</head>

<body>
    <div id="app">
    </div>
    <script type="text/babel">
       class MyComponent extends React.Component{
            constructor(props){
            super(props);
            this.state = {number:0};
            }
            handleClick = ()=>{
                this.setState({
                number: ++this.state.number,
                });
            }

            render(){
            return(
                <div>
                <div>{this.state.number}</div>
                <button onClick={this.handleClick}>click</button>
                </div>
            );
            }
    }
  
    ReactDOM.render(
    <MyComponent/>,
    document.getElementById('app')
    );

    </script>
</body>

</html>